Serper MCP Server

Instructions

Implementation Reference

• src/serper_mcp_server/server.py:62-82 (handler)

  MCP server handler for calling tools. For 'google_search', instantiates SearchRequest from arguments, calls core.google(SerperTools.GOOGLE_SEARCH, request), formats result as JSON text content.

  @server.call_tool()
  async def call_tool(name: str, arguments: dict[str, Any]) -> Sequence[TextContent | ImageContent | EmbeddedResource]:
      if not SERPER_API_KEY:
          return [TextContent(text=f"SERPER_API_KEY is empty!", type="text")]
  
      try:
          if name == SerperTools.WEBPAGE_SCRAPE.value:
              request = WebpageRequest(**arguments)
              result = await scape(request)
              return [TextContent(text=json.dumps(result, indent=2), type="text")]
  
          if not SerperTools.has_value(name):
              raise ValueError(f"Tool {name} not found")
  
          tool = SerperTools(name)
          request = google_request_map[tool](**arguments)
          result = await google(tool, request)
          return [TextContent(text=json.dumps(result, indent=2), type="text")]
      except Exception as e:
          return [TextContent(text=f"Error: {str(e)}", type="text")]

• src/serper_mcp_server/core.py:14-18 (handler)

  Executes Google search tools including 'google_search' by constructing Serper API endpoint (/search for google_search) and delegating to fetch_json for HTTP POST.

  async def google(tool: SerperTools, request: BaseModel) -> Dict[str, Any]:
      uri_path = tool.value.split("_")[-1]
      url = f"https://google.serper.dev/{uri_path}"
      return await fetch_json(url, request)

• src/serper_mcp_server/schemas.py:25-34 (schema)

  Input schema (Pydantic model) for the 'google_search' tool, extending BaseRequest with num results and tbs time filter.

  class SearchRequest(BaseRequest):
      tbs: Optional[str] = Field(
          None, description="The time period to search in, e.g. d, w, m, y"
      )
      num: str = Field(
          "10",
          pattern=r"^([1-9]|[1-9]\d|100)$",
          description="The number of results to return, max is 100 (integer value as string)",
      )

• src/serper_mcp_server/server.py:25-38 (registration)

  Maps SerperTools enums (including GOOGLE_SEARCH='google_search') to input schema classes used in tool registration and call dispatching.

  google_request_map = {
      SerperTools.GOOGLE_SEARCH: SearchRequest,
      SerperTools.GOOGLE_SEARCH_IMAGES: SearchRequest,
      SerperTools.GOOGLE_SEARCH_VIDEOS: SearchRequest,
      SerperTools.GOOGLE_SEARCH_PLACES: AutocorrectRequest,
      SerperTools.GOOGLE_SEARCH_MAPS: MapsRequest,
      SerperTools.GOOGLE_SEARCH_REVIEWS: ReviewsRequest,
      SerperTools.GOOGLE_SEARCH_NEWS: SearchRequest,
      SerperTools.GOOGLE_SEARCH_SHOPPING: ShoppingRequest,
      SerperTools.GOOGLE_SEARCH_LENS: LensRequest,
      SerperTools.GOOGLE_SEARCH_SCHOLAR: AutocorrectRequest,
      SerperTools.GOOGLE_SEARCH_PATENTS: PatentsRequest,
      SerperTools.GOOGLE_SEARCH_AUTOCOMPLETE: AutocorrectRequest,
  }

• src/serper_mcp_server/server.py:41-60 (registration)

  Registers the 'google_search' tool (and others) with MCP server by generating Tool objects from the request map, including name, description, and JSON schema.

  @server.list_tools()
  async def list_tools() -> List[Tool]:
      tools = []
  
      for k, v in google_request_map.items():
          tools.append(
              Tool(
                  name=k.value,
                  description="Search Google for results",
                  inputSchema=v.model_json_schema(),
              ),
          )
  
      tools.append(Tool(
          name=SerperTools.WEBPAGE_SCRAPE,
          description="Scrape webpage by url",
          inputSchema=WebpageRequest.model_json_schema(),
      ))
  
      return tools